Isothermal reduction kinetics and reduction prediction for iron ore pellets  

作　　者：Fei Meng Hao Liu Yue-lin Qin Huang-jie Hua Yin Deng Ze-zheng Sun Long-hai Liu 

机构地区：[1]School of Metallurgy and Materials Engineering,Chongqing University of Science and Technology,Chongqing,401331,China [2]CISDI Group Co.,Ltd.,Chongqing,401122,China [3]College of Materials Science and Engineering,Chongqing University,Chongqing,400044,China [4]Sichuan Desheng Group Vanadium&Titanium Co.,Ltd.,Leshan,614000,Sichuan,China

出　　处：《Journal of Iron and Steel Research International》2025年第1期64-72,共9页钢铁研究学报(英文版)

基　　金：support from the National Natural Science Foundation of China(No.52174300);Natural Science Foundation of Chongqing,China(Nos.cstc2020jcyj-msxmX0583 and cstc2021jcyj-msxmX1004);Chongqing Talent Plan Project(No.cstc2021ycjh-bgzxm0211);Chongqing Doctoral"Through Train"Project(No.sl202100000343).T。

摘　　要：Iron ore pellets,as one of the main charges of blast furnaces,have a greater impact on the CO_(2)emission reduction and stable operation of blast furnaces.The isothermal reduction behavior of the pellets obtained from a Chinese steel plant was studied in the gas mixtures of CO and N_(2).The results showed the reduction process is divided into two stages.The reduction in the initial stage(time t≤40 min)is cooperatively controlled by internal diffusion and interface chemical reactions with the activation energy of 30.19 and 16.67 kJ/mol,respectively.The controlling step of the reduction in the final stage(t>40 min)is internal diffusion with the activation energy of 34.60 kJ/mol.The reduction process can be described by two equations obtained from kinetic calculations.The reduction degree can be predicted under different temperatures and time,and the predicted results showed an excellent correlation with the experimental results.The reduction mechanisms were confirmed by the analysis of the scanning electron microscope equipped with an energy dispersive spectrometer and optical microscope.

关 键 词：PELLET Reduction behavior KINETICS MECHANISM Reduction prediction 

分 类 号：TF053.1[冶金工程—冶金物理化学]